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We experimentally demonstrate the RF photonics filter using optical tapped delay line based on an optical frequency comb and a PPLN waveguide as the multiplexer. RF filters with variable bandwidth, shape and center-frequency are implemented.
We have created microcavity polaritons with a lifetime of about 200 ps, which allows them to condense in the ground state of a ring trap. Optical measurements show they have quantized vorticity.
We report on a narrow-linewidth master oscillator fiber amplifier system continuously tunable from 1010nm to 1086nm, delivering ns pulses with 1mJ energy over the entire band. Tunable second-harmonic generation in the visible is also presented.
We report on the large Kerr induced wavelength shift observed in our hydrogenated amorphous silicon microresonators and demonstrate their use for all-optical modulation and switching on picosecond time scales with only subpicojoule pulse energies.
Low-loss nonlinear AlGaAs waveguides are fabricated using plasma-assisted photoresist reflow. A 6.8-dB continuous-wave four-wave mixing conversion efficiency in a 1.35-µm-wide waveguide, and a 44-nm half-width 3-dB bandwidth in a 0.65-µm-wide waveguide are demonstrated.
We present a chalcogenide microwire device that acts as a compact (∼11 cm length, ∼1 µm diameter) and power efficient (sub-Watt threshold peak power, >2% slope efficiency) Raman-parametric laser, wavelength converter and ultra-broadband supercontinuum generator/amplifier.
We present the experimental observation of the slow-light enhancement effect on the generation of a frequency comb formed by stimulated Brillouin scattering (SBS) in a chip scale As2S3 rib waveguide.
We experimentally demonstrate spectral broadening and shaping of weak mono-exponentially decaying pulses via nonlinear mixing and phase modulation. This method is compatible with single photons wavepackets generated by quantum emitters.
We report a tunable pulsed optical parametric oscillator using a double-prism domain PPLN as simultaneously an electro-optic Q-switch and a parametric generator in a Nd:YVO4 laser. >2.3-kW peak-power eye-safe light was obtained with this system.
355 nm generation was confirmed by using a novel ferroelectric QPM device, PP-LBGO with Fan-out structure as a third harmonic of 1064 nm light. More than 100 mW was generated without any walk-off.
We demonstrate the coherent combination of two solid-core fibers, which are used for nonlinear spectral broadening followed by temporal recompression. 320 fs input pulses coming from a fiber CPA system are split up and independently broadened in the two spatially separated fibers, hence, limitations of individual fibers are lifted. After recombination and compression, sub-30fs pulses were achieved...
Two resonant bands in enhanced optical transmission were predicted in a star shape bull's eye plasmonic structure. Fundamental and its second harmonic resonance were analyzed parametrically to find optimal conditions for linear and nonlinear responses.
We experimentally demonstrate that a minute continuous-wave becalms Raman soliton and thus actively suppresses supercontinuum. The effects are characterized in detail by real-time spectrally-resolved statistical analysis enabled by optical time-stretch.
Here we numerically investigate Brillouin scattering (BS) in a silicon slot waveguide. We show that BS is strongly influenced by the boundary effects, instead of the usual photo-elastic effect leading to the interaction with distinct mechanical modes.
We have obtained record gain of 60 dB with a continuous-wave two-pump fiber optical parametric amplifier, over a 5.5-nm bandwidth. We used a 500-m long fiber, and 1.5 W of pump power.
We suggest using divergence angle as a quality parameter for pure fiber modes. We demonstrate a measurement of the divergence angle of an LP11-mode and obtain agreement with numerical predictions with 2-digit precision.
A doubly-resonant AgGaSe2 mid-infrared optical parametric oscillator (OPO) is synchronously pumped by a hybrid 2 µm Er:fiber/Tm:fiber femtosecond mode-locked laser. The OPO produces spectra ranging from 3–5 µm. Numerical simulations confirm the observed behavior.
Methods for growing periodically alternating polarities of GaN on N-polar and Ga-polar GaN substrates have been developed. The resulting periodically oriented samples can be extended to thick growth, allowing their use in non-linear optics.
The two-photon photovoltaic effect is demonstrated in gallium arsenide at 976 and 1550 nm wavelengths. A waveguide photodiode biased in its fourth quadrant is used to harvest electrical power from photons lost to two-photon absorption.
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